Women are everywhere, if you are skilled you can meet women in the grocery store, at shopping malls or any other place. The ideal place to meet women are places where women don’t have to stress, so trying to meet women at a subway station is probably not the best place.
Places where women hang around for longer periods of times are:
Nightclubs, bars, café’s, parks etc.
A good way to practice meeting women is to ask women for opinions on something or direction… it’s a good way to practice to break the ice.
You can go to a shopping mall and just start talking to the female employers at different shops. It’s good to be warmed up socially before you start talking to women.